Certified Rhythm Analysis Technician (CRAT) Practice Exam

The correct setting for the artifact filter to reduce artifacts due to muscle tremor is typically 40 Hz. This frequency is chosen because muscle tremors usually occur at lower frequencies, and by setting the filter to 40 Hz, it helps to effectively minimize the impact of these tremors on the recorded signals.

When the artifact filter is set at this level, it allows the relevant cardiac signals to pass through while attenuating the higher frequency components associated with muscle movements. This filtration optimizes the clarity and accuracy of the electrocardiographic (ECG) readings or any other test being performed.

Frequently, other frequencies like 150 Hz are selected for filtering out high-frequency noise, and settings like 25 mm/sec or 50 mm/sec refer to paper speed or sampling rates rather than the frequency bands typically used for filtering muscle artifact. Thus, 40 Hz is specifically associated with the reduction of muscle tremor artifacts in this particular context.